CN100576901C - Digit broadcasting system - Google Patents
Digit broadcasting system Download PDFInfo
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- CN100576901C CN100576901C CN200510119277A CN200510119277A CN100576901C CN 100576901 C CN100576901 C CN 100576901C CN 200510119277 A CN200510119277 A CN 200510119277A CN 200510119277 A CN200510119277 A CN 200510119277A CN 100576901 C CN100576901 C CN 100576901C
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- transmission
- transport stream
- descriptor
- ofdm
- signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
- H04N21/4347—Demultiplexing of several video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/26—Arrangements for switching distribution systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
- H04H20/65—Arrangements characterised by transmission systems for broadcast
- H04H20/71—Wireless systems
- H04H20/72—Wireless systems of terrestrial networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2362—Generation or processing of Service Information [SI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
- H04N21/2365—Multiplexing of several video streams
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2383—Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/41—Structure of client; Structure of client peripherals
- H04N21/426—Internal components of the client ; Characteristics thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
- H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
- H04N21/438—Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
- H04N21/4382—Demodulation or channel decoding, e.g. QPSK demodulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]
Abstract
According to the present invention, when by the transport stream of MPEG-2 system being used the OFDM modulation when carrying out received terrestrial digital broadcasting, a plurality of transport stream that connect transmission are divided into group, and these transport stream are coordinated.Then, the broadcasting station produces and connects the transmission descriptor, is used to coordinate to connect a plurality of transport stream of transmission, and describes the connection transmission descriptor that produces in NIT, so that the described transport stream of multiplexing.
Description
The application is to be that August 27 calendar year 2001, application number are 01803027.0, are entitled as the dividing an application of application for a patent for invention of " digit broadcasting system " applying date.
Technical field
The present invention relates to a kind of digit broadcasting system, in described broadcast system, by the ofdm signal that the transport stream of stipulating in the MPEG-2 system according to orthogonal frequency-division transmission system (OFDM) system modulation obtains, broadcast by the radio network that constitutes by a plurality of transmission channels.
Background technology
In Japan, proposed as the ground digital audio droadcasting system use OFDM (orthogonal frequency-division transmission) modulation be called as ISDB-Tn (Integrated Services Digital Broadcasting-arrowband, ground) or ISDB-T
SWBroadcast standard.In addition, in Japan, " the information on services ARIB STD-B10 that is used for digit broadcasting system " application standard as the configuration of the information on services, signal kinds and the data structure that are used for digital broadcasting and identifier thereof has been proposed by radio industry and commercial guild (ARIB)." the information on services ARIB STD-B10 that is used for digit broadcasting system " 1.3 editions have been announced in June, 2000.Hereinafter will call ARIB STD-B10 to " the information on services ARIB STD-B10 that is used for digit broadcasting system ".According to ARIB STD-B10, information on services is stipulated like this, makes to send (ITU-T is ISO/IEC1381-1 H.222.0) by the data structure of utilizing the selection type of stipulating in the MPEG-2 system.In the ground digital audio broadcasting of Japan, the configuration of the information on services of broadcast program is determined according to ARIB STD-B10.Announced 3.1 editions of ARIB STD-B10 on August 25th, 2000, this version is 1.3 editions a revised edition.
When carrying out the digital broadcasting of ofdm system, generally between each channel, provide the frequency interval of specified quantity so as to prevent and adjacent channel between radio frequency interference, thereby buffer zone is provided.In contrast to this, applicant of the present invention has proposed a kind of connection transmission method in international patent application (application number WO00/52861), and wherein adjacent channel connects along the direction of frequency, and the channel that connects is carried out the OFDM modulation.In described connection transmission method, the centre frequency of the ofdm signal in the frequency field of a plurality of transmission channels is changed respectively and ofdm signal is multiplexed along the direction of frequency, and the ofdm signal in the frequency field of a plurality of transmission channels is carried out IFFT (leaf transformation in the contrary good fortune fast) simultaneously and handles.Through above-mentioned processing, can be kept its orthogonality simultaneously along the direction of frequency by multiplexing to the ofdm signal of a plurality of transmission channels transmission.
In the connection transmission method of ofdm signal, though eliminated buffer zone between each channel, ofdm signal can connect a plurality of transmission channels by the direction along frequency axis and be transmitted, thereby can realize having the broadcasting of the frequency availability of improvement.
The current ISDB-Tn that is used for of this connection transmission method.
When carrying out this connection transmission, not only improved frequency availability, and for example, receiver side also has following advantageous effects.
For example, when the transmission channel that is used to receive ofdm signal was switched to another transmission channel, receiver was cancelled synchronization channels before conversion, and after conversion be tuned on the frequency of transmission channel.Then, after conversion, the synchronous code of the transmission of control signals in the receiver detected transmission channel (in the ISDB-Tn system, TMCC (send and multiplexing configuration control) is corresponding to transmission of control signals), and execution OFDM section (frames of the transmission data of ofdm signal) draw in operation synchronously.When finishing drawing in synchronously when operation of OFDM section, the signal of the transmission channel that receiver can the demodulation conversion.
In contrast to this, when connecting transmission, can the OFDM section between channel be produced transmission signals in synchronous.When as mentioned above when the OFDM section produces transmission signals by synchronous the time, receiver can use the synchronization timing of setting up continuously in transmission channel before conversion, also can use the synchronization timing in transmission channel, set up after conversion continuously, even when channel is switched to another channel between each transmission channel that connects transmission therein.Therefore, receiver can simplify be used for restituted signal draw in operation synchronously, thereby can carry out channel switch at a high speed.
In addition, applicant of the present invention has proposed the high speed channel conversion when being connected transmission in Japanese patent application 2000-117226 and 2000-117227.
When the modulating system of transmission channel was a kind of synchronous modulation system, receiver was inserted into the transmission characteristic of SP (pilot tone of dispersion) the signal estimation transmission line in the OFDM section by use, handled thereby carry out wave shape equalization.The SP signal is determined according to the standard of ISDB-Tn.Because the SP signal is inserted discretely with respect to frequency direction, receiver is along these SP signals of frequency direction interpolation, makes receiver can estimate in all sub-carrier positions in transmission channel the transmission characteristic for the OFDM symbol.But, the OFDM symbol of end that is arranged in the frequency direction of transmission channel has than the OFDM symbol of the center that is positioned at transmission channel and is reduced to such an extent that more relate to the quantity of the SP signal that is used to estimate. therefore, and the estimation feature variation in transmission channel along the transmission characteristic of the OFDM symbol of the end of frequency direction.
On the other hand, when the following adjacent channel (being close to the transmission channel of lower frequency side) of last adjacent channel that connects the transport-type synchronous modulation system (transmission channel of contiguous high frequency side) or synchronous modulation system just is present in the transmission channel in received signal, can estimate transmission characteristic by the SP signal that use is included in the neighbouring transmission channel.Thereby the OFDM symbol of end that is arranged in the frequency direction of transmission channel also can obtain to be similar to the interpolation feature of OFDM symbol of core of the frequency direction of transmission channel, and can estimate transmission line character more accurately.
As mentioned above, when connecting transmission, receiver side can carry out channel switch with high speed, perhaps can improve the estimation feature of transmission line character.
But, up to now, whether receiver side also there is no telling is just connecting information transmitted between the transmission channel of received signal and other transmission channel, and whether there is adjacent channel or whether has the information of adjacent channel down, in addition, do not know whether these channels are the information of synchronous modulation system or different modulating system yet.
Summary of the invention
The object of the present invention is to provide a kind of digit broadcasting system, the digital broadcast transmission machine, digital broadcasting transmitter, and digital broadcast method, wherein the signal that obtains by the transport stream of being stipulated by the MPEG-2 system according to orthogonal frequency-division transmission (OFDM) system modulation is used as broadcast singal, thereby receiver side can be known the transmission channel that connects transmission.
The present invention has realized a kind of like this digit broadcasting system, and wherein the ofdm signal that obtains by the transport stream of being stipulated by the MPEG-2 system according to orthogonal frequency-division transmission (OFDM) system modulation is broadcasted by the radio network with a plurality of transmission channels; The connection transmission of wherein carrying out, make be transmitted to a plurality of channels ofdm signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in by the control information of MPEG-2 system regulation and is transmitted.
The present invention has realized a kind of like this digit broadcasting system, and wherein the ofdm signal that obtains by the transport stream of being stipulated by the MPEG-2 system according to orthogonal frequency-division transmission (OFDM) system modulation is broadcasted by the radio network with a plurality of transmission channels; The connection transmission that wherein can in radio network, carry out, make be transmitted to a plurality of channels ofdm signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in by the control information of MPEG-2 system regulation and is transmitted.
The present invention has realized a kind of like this digital broadcasting transmitter, and wherein the ofdm signal that obtains by the transport stream of being stipulated by the MPEG-2 system according to orthogonal frequency-division transmission (OFDM) system modulation is broadcasted by the radio network with a plurality of transmission channels; When transport stream is received in described receiver, the connection transmission of wherein carrying out, make be transmitted to a plurality of channels ofdm signal along frequency direction by multiplexing, keep its orthogonality simultaneously, the connection transmission descriptor of a plurality of transport stream that is used for coordinating connecting transmission is from being extracted by the control information of MPEG-2 system regulation, and receives control according to the information of stipulating in the descriptor that extracts.
The invention provides a kind of digital broadcast method, wherein the ofdm signal that obtains by the transport stream of being stipulated by the MPEG-2 system according to orthogonal frequency-division transmission (OFDM) system modulation is broadcasted by the radio network with a plurality of transmission channels; The connection transmission that wherein can in radio network, carry out, make be transmitted to a plurality of channels ofdm signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in by the control information of MPEG-2 system regulation and is transmitted.
The invention provides a kind of digital broadcast transmission machine, wherein the orthogonal frequency division multiplexing signal that obtains by the transport stream according to the modulation of orthogonal frequency-division transmission system is broadcasted by the radio network with a plurality of transmission channels; The connection transmission that wherein can in radio network, carry out, make be transmitted to a plurality of channels orthogonal frequency division multiplexing signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in control information and is transmitted.
The invention provides a kind of digital broadcasting transmitter, wherein the orthogonal frequency division multiplexing signal by obtaining according to orthogonal frequency-division transmission system modulation transmissions stream is broadcasted by the radio network with a plurality of transmission channels; Wherein when transport stream is received in described receiver, the connection transmission of carrying out, the orthogonal frequency division multiplexing signal that wherein is transmitted to a plurality of channels along frequency direction by multiplexing, keep its orthogonality simultaneously, the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission extracts from control information, and receives control according to the information of stipulating in the descriptor that extracts.
The invention provides a kind of digit broadcasting system, wherein the orthogonal frequency division multiplexing signal that obtains by the transport stream according to the modulation of orthogonal frequency-division transmission system is broadcasted by the radio network with a plurality of transmission channels; The connection transmission that wherein can in radio network, carry out, make be transmitted to a plurality of channels orthogonal frequency division multiplexing signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in control information and is transmitted.
The invention provides a kind of digital broadcast method, wherein the orthogonal frequency division multiplexing signal by obtaining according to orthogonal frequency-division transmission system modulation transmissions stream is broadcasted by the radio network with a plurality of transmission channels; The connection transmission that wherein can in radio network, carry out, make be transmitted to a plurality of channels orthogonal frequency division multiplexing signal along frequency direction by multiplexing, keep its orthogonality simultaneously, and the connection transmission descriptor that is used for coordinating connecting a plurality of transport stream of transmission is included in control information and is transmitted.
Description of drawings
Fig. 1 is the schematic diagram that is used to illustrate according to the digit broadcasting system of one embodiment of the present of invention;
Fig. 2 is the schematic diagram that is used for illustrating at the data configuration (under different modulation case) of the OFDM section that ISDB-Tn stipulates;
Fig. 3 is the schematic diagram that is used for illustrating at the data configuration (under the synchronous modulation situation) of the OFDM section that ISDB-Tn stipulates;
Fig. 4 is the schematic diagram that is used for illustrating the segment structure of stipulating at ISDB-Tn;
Fig. 5 is the schematic diagram that is used to illustrate the data structure that connects the transmission descriptor;
Fig. 6 is used for illustrating at the type of the section of above-mentioned connection transmission descriptor and the schematic diagram of kind;
Fig. 7 is the schematic diagram that is used for illustrating in the type of the modulating system that connects the transmission descriptor;
Fig. 8 is the schematic diagram that is used to illustrate the data structure of NIT;
Fig. 9 is used to illustrate that second connects the schematic diagram of the data structure of transmission descriptor;
Figure 10 is the schematic diagram of data structure that is used to illustrate the floor-based transport descriptor of expansion;
Figure 11 is used to illustrate the schematic diagram of carrying the content of the data that descriptor describes with the ground of expansion;
Figure 12 is the schematic diagram that is used for illustrating the structure of the transmitter that uses at digit broadcasting system;
Figure 13 is the schematic diagram that is used for illustrating the structure of the receiver that uses at digit broadcasting system;
Figure 14 is the schematic diagram that is used to illustrate the floor-based transport table;
Figure 15 is the schematic diagram that is used to illustrate agent list; And
Figure 16 is used to illustrate the schematic diagram that connects transmission table.
Embodiment
The following describes the example that the present invention is applied to the received terrestrial digital broadcasting system of ISDB-Tn (Integrated Services Digital Broadcasting-arrowband, ground) system.ISDB-Tn is the ground digital audio broadcasting standard of using in Japan.
Received terrestrial digital broadcasting system 1 according to embodiments of the invention is a kind of like this system, is wherein received by receiver 200 from a plurality of broadcasting stations 10,20 and 30 terrestrial broadcastings that send respectively by digital system.
In ISDB-Tn, OFDM (orthogonal frequency-division multiplex transmission) modulating system is used as modulating system.In addition, in ISDB-Tn, (ITU-TH.222.0 ISO/IEC13818-1) is used as the digital information sequence that will be transmitted in the MPEG-2 system.In addition, in ISDB-Tn, a transport stream is transferred to a transmission channel.
In addition, in ISDB-Tn, provide many groups, each group is made of the data cell that is called as data segment, and described data segment comprises a plurality of transmission package of stipulating (TSP) in the MPEG-2 system.In addition, pilot signal (pilot tone that SP[disperses], the pilot tone that CP[is continuous], TMCC[transmission and multiplexing configuration control].The AC[auxiliary channel]) be added in the data segment, be called as the transmission frame of OFDM section thereby form, and carry out the OFDM modulation.
The data configuration of OFDM section (under the situation of the mode in the ISDB-Tn standard 1) is shown in Fig. 2 and 3.In Fig. 2 and 3, axis of abscissas is represented the direction of frequency, the direction of axis of ordinates express time.Fig. 2 represents the configuration of OFDM section when information signal is carried out differential modulation (DQPSK).Fig. 3 represents to be carried out synchronous modulation (QPSK, 16QAM, the configuration of OFDM section in the time of 64QAM) when information signal.
As shown in Figures 2 and 3, in ISDB-Tn (mode 1), 204 OFDM symbols (symbol #0-#203) are arranged along time orientation.The OFDM symbol is the unit that is used to simulate FFT.1 OFDM symbol is made of 108 data.The data that constitute each OFDM symbol are modulated into 108 sub-wave carrier pieces (carrier wave # 0=#107) of being distributed to frequency band respectively.
The OFDM section of differential modulating system comprises the various control signal, wherein has the information signal (S according to the DQPSK quadrature modulation
0,0-S
95,203), CP (continuous pilot) signal, TMCC (transmission and multiplexing configuration control) signal, and AC (auxiliary channel) signal.On the other hand, the OFDM section of synchronous modulation system comprises the information signal (S that has according to QPSK, 16QAM, 64QAM quadrature modulation
0,0-S
95,203), CP signal, TMCC signal, AC signal and SP (pilot tone of dispersion) signal.
The CP signal is a kind of the have phase place that is completely fixed and signal of amplitude.When information signal was modulated according to differential modulating system, the CP signal was arranged in the first carrier of each OFDM symbol (position of low-limit frequency).
The SP signal is a kind of signal according to the BPSK modulation.The SP signal with being spaced of 12 carrier waves, and has the interval of 4 symbols along frequency direction along the symbol direction.Because the SP signal is used to estimate transmission line characteristics when the receiver side equalized waveform, (QPSK, 16QAM just are inserted in the OFDM section under situation 64QAM) so the SP signal is only needing the synchronous modulation of wave shape equalization.
TMCC signal and AC signal are the modulation signals according to the BPSK modulation, and in the position section of being arranged on according to the rules.The AC signal is used for additional information transmission.The TMCC signal is to comprise 204 (B
0-B
203) control information transmission, it is used to finish each OFDM segment unit.In the TMCC signal, comprise synchronous code, modulating system, convolutional encoding speed, interlaces lengths etc. are as control information transmission.
In ISDB-Tn, one or 3 above-mentioned OFDM sections are combined in together along frequency direction, thereby form a transmission channel, and send a transport stream.In ISDB-Tn, wherein 3 OFDM sections are arranged and the transmission form that forms a transmission channel is called as three sections forms along frequency direction.Wherein 1 OFDM section is arranged and the transmission form that forms a transmission channel is called as one section form along frequency direction.
In three sections forms, along 1 OFDM section (layer A) of the core of frequency direction and along frequency direction higher or form a transmission channel than 2 OFDM sections adjacent in the lower part (layer B) with central segment.Thereby, can realize the transmission performance of layer A and the different two-layer transmission of transmission performance of layer B.More particularly, in three sections forms, the parameter in layer A is modulating system for example, the code rate of internal code, with time interleaving length can with layer B in different.In addition, in three sections forms, in every layer, carry out frequency interleave.Therefore, even can being received only the receiver section ground of the transmission signals of one section form by its function limitation system, the OFDM section of the layer A in three sections forms receives.
Regulation OFDM section makes and alternatively is applied to ISDB-Tw (broadband, Integrated Services Digital Broadcasting ground) as ground system of digital television broadcast like this.In ISDB-Tw, 13 OFDM sections form one by three layers of configuration layer A, the channel that B and C constitute.
According to the ISDB-Tn of Japan, frequency band for example frequency band of 188MHz-194MHz or the frequency band (bandwidth 6MHz) of 192-198MHz is designated as available frequency band.In ISDB-Tn, the bandwidth of 6MHz is divided into 13 sections.In ISDB-Tn, above-mentioned OFDM section is assigned to 13 sections and transmits.
In addition, in ISDB-Tn, when a plurality of transmission channels were used to connect transmission system, described connection is transmitted between the transmission channel in this 6MHz frequency band 13 sections to be carried out.According to ISDB-Tn, the combination of any amount in the middle of the number of combinations of the section that is positioned at 2 to 13 scopes can be joined together.In addition, the transmission channel of one section form can connect the transmission channel of three sections forms.
In ISDB-Tn, PSI/SI (program provisioning information/information on services) is included in the transport stream, and they are supplementarys, is used to the information selecting program or be used to obtain program, and transmission comprises the transport stream of PSI/SI.The PSI/SI that uses at ISDB-Tn has been defined in MPEG-2 system and ARIB STD-B10.
In MPEG-2 system and ARIB STD-B10, NIT (network information table) is defined as one of PSI/SI information.NIT represents about the information of the physical configuration of the transport stream that is provided by network and the feature of network thereof.In ARIB STD-B10, provide a regulation as described below.Promptly, floor-based transport descriptor [terrestrial_delivery_system_descriptor ()] or agent list descriptor service describing table [service_list_descripter ()] are included in the transport stream ring among the NIT, and transmission comprises their described transport stream ring, wherein said floor-based transport descriptor descriptor is represented the physical condition about broadcast singal itself, for example frequency information or the transmission parameter relevant with the transport stream that belongs to described network.
Now, the present inventor's decision, the connection transmission descriptor [connected_transmission_descriptor ()] of wherein describing the physical condition of the transport stream that belongs to the network that connects transmission is newly defined as the descriptor that is included among the NIT (network information table).
The following describes and connect transmission descriptor [connected_transmission_descriptor ()].
Fig. 5 represents to connect the data structure of transmission descriptor [connected_transmission_descriptor ()].
Connecting transmission descriptor [connected_transmission_descriptor ()] is the group that can discern the transport stream that connects transmission, thereby enumerates the descriptor of the transport stream in the group.Connecting transmission descriptor [connected_transmission_descriptor ()] is described in the ring at the TS of NIT.
In [descriptor_tag], the sign that is used for descriptor and the differentiation of other descriptor is described.
In [descriptor_length], all low byte numbers continuously are described.
In [connected_transmission_group_id], the connection transmission group ID of the group that is used to discern the transport stream that connects transmission is described.
In [segment_type], the type of the section of explanation form, the transport stream that is used to discern by connecting the appointment of transmission descriptor is to have one section form or have three sections forms.[segment_type] is 2 information.As shown in Figure 6, one section form of " 00 " expression, three sections forms of " 01 " expression, the decision that " 11 " expression is made by means of reference TMCC signal." 10 " expression keeps for using in the future.
In [modulation_type_A], the type of modulating system is described, expression is synchronous modulation system or differential modulating system.[modulation_type_A] be illustrated under the situation of one section form whole section data the modulating system type and in the modulating system type of the A of situation lower floor of three sections forms.[modulation_type_A] represents one two information.As shown in Figure 7, " 00 " represents differential modulating system (DQPSK), and " 01 " expression synchronous modulation system (QPSK, 16QAM, 64QAM), and the decision that " 11 " expression is made by reference TMCC signal, " 10 " expression gives in the future to be used.
In [modulation_type_B], the type of modulating system is described, the modulating system that is illustrated in the layer B in three sections forms is synchronous modulation system or differential modulating system.[modulation_type_B] is insignificant under the situation of one section form.[modulation_type_B] is one two information, [modulation_type_A] is the same, " 00 " represents differential modulating system (DQPSK), " 01 " expression synchronous modulation system (QPSK, 16QAM, 64QAM), the decision that " 11 " expression is made by reference TMCC signal, " 10 " expression gives in the future to be used.
In [additional_connected_transmission_info], the side information by the regulations of using enterprise is described.
Fig. 8 represents the data structure of NIT, and above-mentioned connection transmission descriptor [connected_transmission_descriptor ()] wherein is described.
NIT (network information table) is an information table, is used to represent about the information of the physical configuration of the transport stream that provided by network and the feature of network itself thereof.In NIT, expression comprise himself network information NIT and represent the NIT of the information of other network.
[table_id] specifies an identifier, is used to represent what the network information partly represents.Under the situation of the NIT of himself network, the value of " 0 * 40 " has been described.Under the situation of the NIT of other network, the value of " 0 * 41 " has been described.
[section_syntax_indicator] specifies an identifier, be used to represent the sentence structure instruction of part, and its value always is set to " 1 ".
[reserved_future_use] specifies one to keep extended area, can stipulate any information of using in the future therein.
[reserved] specifies a reserve area.
[section_length] regulation from directly after the partial-length section to the back-page byte number of the part that comprises CRC (cyclic redundancy check (CRC)).
[network_id] indication is used to discern the network by the NIT appointment.
[version_number] specifies the version number of sublist.
[current_next_indicator] specifies identifier, represents that when its value is " 1 " sublist is current sublist, represents that when its value is " 0 " sublist that is provided is not used, and uses next sublist.
[section_number] specifying part mark.When part when being first in the sublist, its value is " 0x00 ".One of every increase have identical [table_id] and [network_id] part, the part number increases by 1.
[last_section_number] specifies the decline of the sublist that comprises a part, promptly has the part number of largest portion number.
[network_descriptor_length] specifies all byte numbers of a ring of network description symbol (descriptor ()) in succession.In described ring, has network identifier.
[transport_stream_loop_length] specifies all byte numbers of the transport stream ring that directly finished before first byte of CRC.
The TS ring then is described below.
[transport_stream_id] in TS ring specifies and is used for ID that transport stream and other multiplexing of conveying system are distinguished mutually.
[original_network_id] specifies the ID of [network_id] be used to represent original network.
[transport_descriptor_length] specifies an identifier, is used to represent all byte numbers of a ring of transmission descriptor (descriptor ()) in succession.In the transmission descriptor, illustrate and connect transmission descriptor [connected_transmission_descriptor ()], floor-based transport descriptor [terrestrial_delivery_system_descreptor ()] and agent list descriptor Service DescriptionTable[servic_list_descriptor ()].
[CRC_32] specifies CRC and comprise that the register that the obtains output of crc value is the error code of " 0 " after entire portion is processed.
As mentioned above, connect a plurality of transmission channels (transport stream) that transmission descriptor [connected_transmission_descriptor ()] is used to coordinate to connect transmission.Therefore, connect the transmission descriptor and be included in the control information of MPEG-2 system, make that a plurality of transport stream that connect transmission are coordinated, and the transport stream notice receiver of coordinating.
Thereby, the receiver analysis is included in the connection transmission descriptor among the NIT, thereby make receiver can determine in comprising the section of the current transport stream of receiving, whether to exist to carry out its connect transmission on adjacent segment (section adjacent) with high frequency side, perhaps whether there is the following adjacent segment (section adjacent) of carrying out its connection transmission, and determines that the described modulating system of going up adjacent segment or following adjacent segment is synchronous modulation system or differential modulating system with lower frequency side.Thereby when the modulating system of the section that comprises the current transport stream of receiving was synchronous modulation system, receiver just can be by using the SP signal estimation transmission characteristic that comprises in neighbouring section.Use the SP signal estimation transmission characteristic of adjacent segment in the manner described above, the transmission characteristic of the subcarrier of the frequency direction of feasible edge section can accurately be estimated, and can be made wave shape equalization more accurately.
When the adjacent transmission channel (transport stream) that carries out its connection transmission had three sections forms, the layer B in adjacent transmission channel was as adjacent segment.When the modulating system of layer B is synchronous modulation system, can use SP signal estimation transmission characteristic.In addition, when the transmission channel that receives transport stream has three sections forms, be layer B in the transmission channel (transport stream) at itself with the adjacent section of section of layer A.Be layer A in the transmission channel (transport stream) at himself with the adjacent section of section of layer B in addition, and the section of other transmission channel (other transport stream).
In addition, when the receiver analysis is included in connection transmission descriptor among the NIT so that the channel switch that receives transport stream during to another transmission channel, whether receiver can obtain to exist about the transmission channel before conversion and the information of the relation between the transmission channel after changing.When the information that exists about the relation between the transmission channel after transmission channel before conversion and the conversion, receiver just can use the synchronization timing of setting up unceasingly in transmission channel before changing after conversion.Therefore, receiver can simplify be used for demodulation draw in operation synchronously, and reduce the channel switch time.
Above-mentioned connection transmission descriptor has been defined in the 27 ARIB STD-B103.1 versions of publishing 2001,7.
As being used to coordinate a plurality of methods that connect the transmission channel (transport stream) of transmission, although understand an example, connection transmission descriptor [connected_transmission_descriptor ()] wherein shown in Figure 5 is included among the NIT and is transmitted, but also can connect transmission descriptor [connected_transmission_descriptor2 ()] and coordinate a plurality of transmission channels (transport stream) by second, as described below, and obtain a new floor-based transport by expansion by the floor-based transport descriptor [terrestrial_delivery_system_descreptor ()] of ARIB STD-B10 regulation and describe [terrestrial_delivery_system_descreptor2 ()].
Fig. 9 represents that second connects the data structure that [connected_transmission_descriptor2 ()] described in transmission.
Connect transmission descriptor [connected_transmission_descriptor2 ()] and specify a descriptor, it can enumerate the transport stream that is connected transmission together with transport stream.Connecting transmission descriptor [connected_transmission_descriptor2 ()] has for example illustrated in the TS ring of the NIT of self network.
[descriptor_tag] specifies a mark that is used for described descriptor and the differentiation of other identifier.
[descriptor_length] specifies all byte numbers of ring in succession (to mean [for (I=0;＜N; I++) to}]) a ring.
At ring [for (I=0;＜N; I++) to}]) in, [origina_network_id] and [transport_stream_id] described.
[original_network_id] specifies the original network of network ID of the transport stream that connects transmission.
[transport_stream_id] specifies the ID that is used to discern the transport stream that connects transmission.
Figure 10 represents the floor-based transport descriptor [terrestrial_delivery_system_descreptor2 ()] expanded.
Floor-based transport descriptor [terrestrial_delivery_system_descreptor2 ()] is specified the descriptor of the physical condition be used to discern the terrestrial transmission line.The floor-based transport descriptor has illustrated in the ring at the TS of NIT.
[descriptor_tag] specifies a mark that is used for described descriptor and the differentiation of other identifier.
[descriptor_length] specifies all byte numbers of data in succession.
[area_code] specifies the coverage that transport stream will be transferred to.[area_code] is extended to 16, as shown in figure 11.
The guard interval of [guard_interval] specific transport stream.
The mode information of [transmision_mode] specific transport stream.
[segment_type] specifies one 1 information, and being used for identification is one section form or three sections forms.For example, as shown in figure 11, under the situation of one section form, be described as " 0 ".Under three sections forms, be described as " 1 ".This [segment_type] is a fresh information that does not have regulation in ARIB STD-B 10.
[modulation_type_A] specified section form identifying information, it is one 1 a information, the section form that is used for marker A is synchronous modulation system or differential modulating system.For example, as shown in figure 11, when layer A represents synchronous modulation system, be described as " 0 ", when layer A represents differential modulating system, be described as " 1 ".[modulation_type_A] is a fresh information that does not have regulation in ARIB STD-B10.
[modulation_type_B] specified section form identifying information, it is one 1 a information, the section form that is used for marker B is synchronous modulation system or differential modulating system.For example, as shown in figure 11, when layer B represents synchronous modulation system, be described as " 0 ", when layer B represents differential modulating system, be described as " 1 ".[modulation_type_B] is a fresh information that does not have regulation in ARIB STD-B10.
[modulation_type_C] specified section form identifying information, it is one 1 a information, the section form that is used for marker C is synchronous modulation system or differential modulating system.For example, as shown in figure 11, when layer C represents synchronous modulation system, be described as " 0 ", when layer C represents differential modulating system, be described as " 1 ".[modulation_type_C] is a fresh information that does not have regulation in ARIB STD-B10.
[frequency] specifies an identifier, is used to indicate the frequency that is used to transmit transport stream.
The second above-mentioned floor-based transport that connects transmission descriptor [connected_transmission_descriptor2 ()] and expansion is retouched [terrestrial_delivery_system_descreptor_2 ()] and has also been described in the ring at the TS of NIT, thereby a plurality of transport stream that connect transmission can be coordinated jointly, thereby with the transport stream notice receiver of coordinating.
The following describes the transmitter 100 that in dispatching station 10, connects transmission.
As shown in figure 12, transmitter 100 comprises multiple source encoder 101a (101a-101 is to 101a-n), OFDM transmitter 102, antenna 103 and system controller 104.
For each source encoder 101a, video data or the voice data of input in a base band.They for example are compressed according to the MPEG-2 system and are encoded, thereby produce program stream.Source encoder 101a carries out multiplexing respectively to these a plurality of program streams, thereby is formed on the transport stream of stipulating in the MPEG-2 system.From each transport stream of each source encoder 101a output corresponding to each transmission channel.In addition, for each source encoder 101a input control information (PSI/SI information), the NIT that in system controller 104, produces for example.Described control information also is included in the transport stream and to the described control information of transport stream multiplexing.In control information, comprise above-mentioned connection transmission descriptor [connected_transmission_descriptor ()].
102 pairs of OFDM transmitters are that each transport stream that each transmission channel is imported is carried out the transmission line encoding process from each source encoder 101a, thereby form the OFDM symbol of each transport stream unit of conduct as shown in Figures 2 and 3.Then, a plurality of OFDM symbols that OFDM transmitter 102 produces respectively transmission channel synchronously along time base direction, and along these OFDM symbols of frequency direction multiplexing.Then, 102 pairs of OFDM transmitters carry out while IFFT conversion along the multiplex OFDM symbol of frequency direction, and multiplex OFDM symbol is carried out the OFDM modulation.OFDM transmitter 102 carries out above-mentioned processing, makes OFDM transmitter 102 to link together a plurality of transmission channels.Then, the transmission ripple of a plurality of transmission channels that connected by OFDM transmitter 102 sends to the outside by antenna 103.
The following describes the receiver 200 of the terrestrial broadcasting ripple that is used to receive transmission.
As shown in figure 13, receiver 200 comprises demodulation part 201, and broadcast singal inputs to described demodulation part from the antenna 220 of the broadcast wave that is used to receive terrestrial broadcasting, thereby broadcast singal is carried out demodulation process; Decoded portion 202 is used for the signal by demodulation part 201 digital demodulations is carried out decoding processing, thereby takes out transport stream; Extract part 203, be used to extract the multiplex numerical data of transport stream, thereby carry out output corresponding to the content of numerical data by taking out to decoded portion 202; Audio decoder 204, Video Decoder 205 and data decoder 206 are offered these decoders respectively by the numerical data of extracting part 203 extractions, thereby are produced audio signal, vision signal and data-signal respectively; Be used for keeping being included in the memory 208 of the control information (PSI/SI information) of transport stream; The system controller 209 of various piece that is used for receiver control 200 is by the operation input section 211 of user's input operation, and is used for the display part 212 to user's video data.
The 201 pairs of broadcast singals by reception antenna 220 inputs in demodulation part carry out digital demodulation to be handled.
Decoded portion 202 is by carrying out release of an interleave and handle or carry out error correction process to signal decoding with respect to the signal of digital modulation in demodulation part 201, thereby takes out transport stream.
Extract part 203 and extract each TS bag according to the PID (bag identification number) that in the bag of the TS from the transport stream of decoded portion 202 inputs, describes, thereby the numerical data that decision is included in each TS bag belongs to audio signal or belongs to vision signal, and to audio decoder 204 or Video Decoder 205 each numerical data of output.In addition, extract part 203 and extract the PSI/SI information that is included in the transport stream, for example NIT, SDT and BAT, and each information that is included in the PSI/SI information exported to system controller 209.
When just reception has only the audio broadcasting of audio-frequency information simply, in receiver 200, can not provide Video Decoder 205 and data decoder 206.
Memory 208 can be made of various rewritable semiconductor memories, and it is attached on receiver 200 for example can be pulled down ground.
In operation input section 211, carry out various types of operations by the user for receiver, for example receive sign on, service change instruction and quantity of service is set.
The following describes the database that on memory 208, constitutes.
On memory 208, the floor-based transport table, the transmission relation that is connected of agent list and transport stream is configured as database.
The system controller 209 of receiver 200 is according to constituting floor-based transport table and agent list by NIT that extracts part 203 inputs and SDT (service describing table), shown in Figure 14 and 15.In NIT, floor-based transport descriptor and agent list descriptor are described.Thereby these descriptors are made to constitute above-mentioned floor-based transport table and agent list by reference.In floor-based transport table and agent list, according to " transport_stream_id " of the information that is used to discern each transport stream, the information relevant with the transport stream of transmitting in all coverages be included in the PSI that is transmitted in NIT in is tabulated.But, for the quantity of the memory that reduces receiver, needn't always store and keep all information.
For example, be appreciated that, by according to " transport_stream_id " reference ground conveying system table, be included in and be used for receiving " frequency " that wherein " transport_stream_id " is the required information of the transport stream of " TS1 ", " mode ", " guard interval ", " area code " specifies " xxxMHz, " respectively, " 10 ", " 11 " and " 201010010011 ".Similarly, by the Reference Services table make it possible to understand respectively be used for regulation be included in the service that " transport_stream_id " is the transport stream of " TS1 " (program) required " service ID " and or " COS " be " TS1 " conduct " serve 2 " and " audio broadcasting ".
Thereby receiver 200 reference ground conveying system table and agent lists make receiver can be transformed into reception from the service (program) that is receiving other service (program).
In addition, the system controller 209 of receiver 200 extracts connection transmission descriptor [connected_transmission_descriptor ()] among the NIT from the transport stream of current reception as required, thereby constitute to connect transmission table, described connection transmission table is connected transmission descriptor and " service ID " and is obtained " network ID " expression " TS-id " and " being connected transmission group ID " by each by tabulation.
Connect transmission table and be configured, thereby can come with the transport stream difference of current reception by other transport stream that connects the coordination of transmission descriptor according to above-mentioned.For example, when the transport stream with connection transmission relation was switched to other transport stream, by the above-mentioned table of reference, transport stream can be changed fast.
In addition, when receiving when current reception service (program) is transformed into another service (program), system controller 209 is at first with reference to the connection transmission table that constitutes on memory 208.In this case, when transport stream that the transport stream of current reception is switched to is connecting on the transmission table, then carry out common begin to receive handle.On the other hand, when transport stream that the transport stream of current reception is switched to is being connected on the transmission table, then be converted, keep simultaneous operation simultaneously for demodulation at channel.
Because always do not connect the transmission descriptor, so, can not constitute the connection transmission table for the transport stream that does not connect transmission process for all transport stream regulations.
In addition because for each transport stream its to connect transmission relation be different, so when a transport stream is switched to another transport stream, the connection transmission table is updated.
Commercial Application
According to digit broadcasting system of the present invention, digital broadcast transmission machine, digital broadcasting transmitter and number In the word broadcasting method, can use by existing according to orthogonal frequency-division transmission (OFDM) system modulation The MPTS of stipulating in the MPEG-2 system and the signal that obtains are as broadcast singal. When connecting transmission, The ofdm signal that wherein will be transferred to a plurality of transmission channels when keeping quadrature along the frequency direction quilt During multiplexing, be used for the connection transmission descriptor bag that coordination connects a plurality of MPTSs of transmission process Draw together in the control information of in the MPEG-2 system, stipulating and be transmitted.
Thereby according to the present invention, receiver side can be known the channel that connects transmission.
Claims (9)
1. digital broadcast transmission machine, it is according to the transport stream of OFDM orthogonal frequency-division transmission system modulation by MPEG-2 system regulation, and the transport stream of the modulation that is carried on network is characterized in that described digital broadcast transmission machine comprises:
The OFDM part is used for generating the OFDM symbol in each transport stream, along the OFDM symbol of the multiplexed a plurality of transport stream of frequency direction, is one group with the simultaneously contrary fast fourier transform of multiplexed OFDM symbol, so that send transport stream by connecting transmission;
The systems control division branch is used to generate the control information that comprises connection transmission descriptor;
The connection transmission descriptor that wherein is used for coordinating connecting a plurality of transport stream of transmission is included in control information and is transmitted.
2. digital broadcast transmission machine as claimed in claim 1, wherein said descriptor is included in the network information table and is transmitted.
3. digital broadcast transmission machine as claimed in claim 1 wherein is described in the physical condition that connects when transmission with described descriptor.
4. digital broadcasting transmitter, the ofdm signal that the transport stream that its reception is stipulated by the MPEG-2 system according to the modulation of OFDM orthogonal frequency-division transmission system generates and is carried on network, described transport stream has the control information that comprises connection transmission descriptor, it is characterized in that described digital broadcasting transmitter comprises:
Demodulator is used for the ofdm signal of demodulate reception;
Decoder, the ofdm signal of the demodulation that is used to decode and extract transport stream;
Extract part, be used for the demultiplexing transport stream and extract numerical data;
Storage area is used to store the control information that comprises connection transmission descriptor;
System controller is used for the each several part received signal from described digital broadcasting transmitter, and controls the operation of described digital broadcasting transmitter;
Wherein said system controller extracts connection transmission descriptor from the transport stream that receives and connects transmission table with formation, can come with the transport stream difference that receives by connecting other transport stream of transmitting the symbol coordination.
5. digital broadcasting transmitter as claimed in claim 4, wherein when transmission channel is converted, determine whether carried out connect transmitting between transmission channel before conversion and the transmission channel after the conversion according to described descriptor, when connecting transmission, then in the synchronous demodulation that keeps the orthogonal frequency-division transmission system, transmission channel is transformed into another transmission channel.
6. digital broadcasting transmitter as claimed in claim 4, wherein when receiving the orthogonal frequency division multiplexing signal of synchronous modulation system, make adjacent transmission channel connect transmission, when adjacent transmission channel or adjacent part send the orthogonal frequency division multiplexing signal of synchronous modulation system, be included in the pilot signal estimation transmission line characteristics in the orthogonal frequency division multiplexing signal of adjacent transmission channel or adjacent part by use.
7. a digital broadcast method is wherein modulated the transport stream of being stipulated by the MPEG-2 system according to OFDM orthogonal frequency-division transmission system, and the transport stream of the modulation that is carried on network is characterized in that described method comprises step:
In each transport stream, generate the OFDM symbol;
OFDM symbol along the multiplexed a plurality of transport stream of frequency direction;
With the simultaneously contrary fast fourier transform of multiplexed OFDM symbol is one group, so that send transport stream by connecting transmission;
Generation comprises the control information that connects the transmission descriptor; And
The connection transmission descriptor that will be used for coordinating connecting a plurality of transport stream of transmission is included in control information, and control information transmission.
8. digital broadcast method as claimed in claim 7, wherein said descriptor is included in the network information table and is transmitted.
9. digital broadcast method as claimed in claim 7 wherein is described in the physical condition that connects when transmission with described descriptor.
Applications Claiming Priority (2)
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| JP2000254866 | 2000-08-25 | ||
| JP254866/00 | 2000-08-25 |
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| CNB018030270A Division CN1236572C (en) | 2000-08-25 | 2001-08-27 | Digital broadcast system |
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| CN100576901C true CN100576901C (en) | 2009-12-30 |
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| CNB018030270A Expired - Lifetime CN1236572C (en) | 2000-08-25 | 2001-08-27 | Digital broadcast system |
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| CN (2) | CN100576901C (en) |
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2001
- 2001-08-27 US US10/111,527 patent/US7697411B2/en not_active Expired - Fee Related
- 2001-08-27 CN CN200510119277A patent/CN100576901C/en not_active Expired - Lifetime
- 2001-08-27 AU AU80183/01A patent/AU784822B2/en not_active Expired
- 2001-08-27 JP JP2002522097A patent/JP4352701B2/en not_active Expired - Lifetime
- 2001-08-27 BR BRPI0107141-6A patent/BRPI0107141B1/en active IP Right Grant
- 2001-08-27 CN CNB018030270A patent/CN1236572C/en not_active Expired - Lifetime
- 2001-08-27 WO PCT/JP2001/007317 patent/WO2002017524A1/en active Application Filing
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2010
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- 2010-10-04 JP JP2010225236A patent/JP5018953B2/en not_active Expired - Fee Related
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- 2010-10-04 JP JP2010225234A patent/JP5071544B2/en not_active Expired - Lifetime
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| BRPI0107141B1 (en) | 2015-06-16 |
| JP5018954B2 (en) | 2012-09-05 |
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| JP2011055520A (en) | 2011-03-17 |
| WO2002017524A1 (en) | 2002-02-28 |
| CN1393074A (en) | 2003-01-22 |
| JP2011045116A (en) | 2011-03-03 |
| US20030103446A1 (en) | 2003-06-05 |
| JP5071544B2 (en) | 2012-11-14 |
| CN1767626A (en) | 2006-05-03 |
| US7697411B2 (en) | 2010-04-13 |
| AU8018301A (en) | 2002-03-04 |
| JP2011004433A (en) | 2011-01-06 |
| AU784822B2 (en) | 2006-06-29 |
| JP5018952B2 (en) | 2012-09-05 |
| JP2011045117A (en) | 2011-03-03 |
| BR0107141A (en) | 2002-07-02 |
| JP4352701B2 (en) | 2009-10-28 |
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